package com.itheima.config;

import com.itheima.common.JacksonObjectMapper;
import com.itheima.filter.LoginCheckInterceptor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.util.List;

@Slf4j
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
    //注入拦截器
    @Autowired
    private LoginCheckInterceptor loginCheckInterceptor;

    //添加拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(loginCheckInterceptor)
                //设置拦截所有资源
//                .addPathPatterns("/**")
                //排除不拦截的资源
                .excludePathPatterns("/employee/login")
                .excludePathPatterns("/employee/logout")
                .excludePathPatterns("/backend/**")
                .excludePathPatterns("/front/**")
                .excludePathPatterns("/user/sendMsg")
                .excludePathPatterns("/user/login");
    }

    /**
     * 设置静态资源映射
     * 对静态资源的访问因为是放在文件夹下的无法自动访问需要配置
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        log.info("开始进行静态资源映射...");
        registry.addResourceHandler("/backend/**").addResourceLocations("classpath:/backend/");
        registry.addResourceHandler("/front/**").addResourceLocations("classpath:/front/");
    }

    /**
     * 扩展mvc框架的消息转换器
     * @param converters
     */
    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        //创建消息转换对象
        MappingJackson2HttpMessageConverter messageConverter=new MappingJackson2HttpMessageConverter();
        //设置对象转换器，底层使用Jackson将java转换为json
        messageConverter.setObjectMapper(new JacksonObjectMapper());
        //将上面的消息转换为对象追加到mvc框架的转换器集合中
        converters.add(0,messageConverter);
    }
}
